A Novel Workflow for Geosteering a Horizontal Well in a Low Resistivity Contrast Anisotropic Environment: A Case Study in Semoga Field, Indonesia

Yessica Fransisca, Karinka Adiandra, V. Manurung, Laila Warkhaida, M. Arham, Y. Yanto, Dwi Hudya Febrianto, Achmad Yaser
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Abstract

This paper describes the combination of strategies deployed to optimize horizontal well placement in a 40 ft thick isotropic sand with very low resistivity contrast compared to an underlying anisotropic shale in Semoga field. These strategies were developed due to previously unsuccessful attempts to drill a horizontal well with multiple side-tracks that was finally drilled and completed as a high-inclined well. To maximize reservoir contact of the subject horizontal well, a new methodology on well placement was developed by applying lessons learned, taking into account the additional challenges within this well. The first approach was to conduct a thorough analysis on the previous inclined well to evaluate each formation layer’s anisotropy ratio to be used in an effective geosteering model that could better simulate the real time environment. Correct selections of geosteering tools based on comprehensive pre-well modelling was considered to ensure on-target landing section to facilitate an effective lateral section. A comprehensive geosteering pre-well model was constructed to guide real-time operations. In the subject horizontal well, landing strategy was analysed in four stages of anisotropy ratio. The lateral section strategy focused on how to cater for the expected fault and maintain the trajectory to maximize reservoir exposure. Execution of the geosteering operations resulted in 100% reservoir contact. By monitoring the behaviour of shale anisotropy ratio from resistivity measurements and gamma ray at-bit data while drilling, the subject well was precisely landed at 11.5 ft TVD below the top of target sand. In the lateral section, wellbore trajectory intersected two faults exhibiting greater associated throw compared to the seismic estimate. Resistivity geo-signal and azimuthal resistivity responses were used to maintain the wellbore attitude inside the target reservoir. In this case history well with a low resistivity contrast environment, this methodology successfully enabled efficient operations to land the well precisely at the target with minimum borehole tortuosity. This was achieved by reducing geological uncertainty due to anomalous resistivity data responding to shale electrical anisotropy. Recognition of these electromagnetic resistivity values also played an important role in identifying the overlain anisotropic shale layer, hence avoiding reservoir exit. This workflow also helped in benchmarking future horizontal well placement operations in Semoga Field. Technical Categories: Geosteering and Well Placement, Reservoir Engineering, Low resistivity Low Contrast Reservoir Evaluation, Real-Time Operations, Case Studies
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低电阻率对比各向异性环境下水平井地质导向的新工作流程:以印度尼西亚Semoga油田为例
本文介绍了在Semoga油田40英尺厚的各向异性砂岩中优化水平井布置的策略组合,与Semoga油田的各向异性页岩相比,该砂岩的电阻率非常低。这些策略的产生是由于之前的多侧径水平井钻井尝试失败,最终以高斜度井的形式钻完井。为了最大限度地提高目标水平井的储层接触面积,考虑到该井的其他挑战,通过吸取经验教训,开发了一种新的井位方法。第一种方法是对之前的斜井进行全面分析,以评估每个地层层的各向异性比,并将其用于有效的地质导向模型中,从而更好地模拟实时环境。在全面的井前建模的基础上,正确选择地质导向工具,以确保目标着陆区段,从而促进有效的横向区段。建立了一个全面的地质导向井前模型,以指导实时作业。以主体水平井为例,分析了各向异性比的四个阶段的着陆策略。横向剖面策略侧重于如何满足预期断层并保持轨迹以最大限度地暴露油藏。地质导向作业的实施使储层接触率达到100%。在钻井过程中,通过电阻率测量和伽马射线钻头数据监测页岩各向异性比的行为,该井精确地定位在目标砂顶以下11.5英尺TVD处。在横向段,与地震估计相比,井眼轨迹与两条断层相交,显示出更大的相关断层。利用电阻率地球信号和方位电阻率响应来保持目标储层内的井筒姿态。在这口具有低电阻率对比环境的历史井中,该方法成功地实现了高效的作业,以最小的井眼弯曲度将井精确地定位在目标位置。这是通过减少由响应页岩电性各向异性的异常电阻率数据引起的地质不确定性来实现的。这些电磁电阻率值的识别对于识别上覆各向异性页岩层也起到了重要作用,从而避免了储层的流出。该工作流程还有助于为Semoga油田未来的水平井定位作业制定基准。技术类别:地质导向和井位,油藏工程,低电阻率低对比油藏评价,实时操作,案例研究
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